I got an old Thinkpad 770.. bout 4 years old. Pentium 266 processor. Bought it used on ebay for 300.00, with all acessories and a leather case. I spent another 200 on a DVD drive and a magri DVD card, and blew the RAM up to 128meg. Every possible accesory you can think of is availible fer cheap on ebay; awsome product support and manuals are on the IBM sites.
This old machine sits on my 34 foot sailboat.. in a salt water maritime enviornment it runs an interface between my GPS and my Combi autopilot with a charting program. When it ain't telling me where I am or where I'm going or how much longer it's gonna be till we get there, it's playing DVD movies, muisc CD's or games to keep the kids un-bored.
It's never failed to boot, never crashed, has been soaking wet at least twice, dropped a half dozen times.. in short, I'd never think of buying any laptop in the future that didn't say IBM on it.